WO1999060806A1 - Flux density reduction in ocdma satellite communication system - Google Patents

Flux density reduction in ocdma satellite communication system Download PDF

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Publication number
WO1999060806A1
WO1999060806A1 PCT/US1999/010905 US9910905W WO9960806A1 WO 1999060806 A1 WO1999060806 A1 WO 1999060806A1 US 9910905 W US9910905 W US 9910905W WO 9960806 A1 WO9960806 A1 WO 9960806A1
Authority
WO
WIPO (PCT)
Prior art keywords
signal
orthogonal
receiver
frequency
different beams
Prior art date
Application number
PCT/US1999/010905
Other languages
English (en)
French (fr)
Inventor
John Ohlson
Francis D. Natali
Original Assignee
Stanford Telecommunications, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Stanford Telecommunications, Inc. filed Critical Stanford Telecommunications, Inc.
Priority to JP2000550291A priority Critical patent/JP4527879B2/ja
Priority to DE69934883T priority patent/DE69934883T2/de
Priority to EP99933473A priority patent/EP1077006B1/de
Priority to AU49520/99A priority patent/AU4952099A/en
Publication of WO1999060806A1 publication Critical patent/WO1999060806A1/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/69—Spread spectrum techniques
    • H04B1/707—Spread spectrum techniques using direct sequence modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/204—Multiple access
    • H04B7/216—Code division or spread-spectrum multiple access [CDMA, SSMA]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • PCS Communications Systems
  • CDMA Code Division Multiple Access
  • each beam compared to orthogonal systems such as FDMA or TDMA, which would typically
  • the Globalstar application discloses a signal which is essentially the same as the IS-95
  • This system uses Orthogonal CDMA (OCDMA) on the forward
  • OCDMA forward and return links are being considered for satellite PCS systems.
  • the capacity of a synchronous OCDMA system can be increased, under certain
  • OCDMA system may be increased by employing 1 :3 frequency reuse rather than full frequency
  • frequency isolation is more important than additional
  • the object of this invention is to allow the capacity increase in a synchronous OCDMA
  • Another object of this invention is to allow the capacity increase in a synchronous
  • OCDMA system gained by employing a frequency reuse factor other than one, and still allow
  • a spread spectrum CDMA communication system in which one or more base stations
  • the base station(s) transmits a signal for each beam which is
  • PN pseudo-noise
  • Each subscriber terminal has a receiver
  • frequencies are formed to be assigned in the 1 :N ra beam frequency reuse pattern.
  • a spread spectrum CDMA satellite communication system in which more than one
  • satellite illuminates the same region on the earth, and one or more base stations communicate
  • the base station(s) transmits a signal for each beam which is comprised of a set of orthogonally spaced subcarriers, each of which is modulated by a set of orthogonal, or
  • PN pseudo-noise
  • Each subscriber terminal has a receiver with means to coherently
  • the improvement comprising:
  • a spread spectrum CDMA satellite communication system in which another satellite
  • communication system illuminates the same region on the earth, and one or more base stations
  • the base stat ⁇ on(s) transmits a signal for each beam which is
  • PN pseudo-noise
  • Each subsc ⁇ ber terminal has a receiver
  • a spread spectrum CDMA satellite communication system in which another satellite
  • terminals located in different beams of the multi-beam satellite relay system communicate with
  • the subsc ⁇ ber terminals transmit a signal which is comp ⁇ sed
  • PN pseudo-noise
  • Each base station has
  • subscriber terminal transmit signal to spread the signal energy over a wider
  • frequencies are formed to be assigned in the 1 :N ru beam frequency reuse pattern.
  • Figure 1 is a schematic illustration of a satellite based OCDMA communication system
  • Figure 2 is a graph illustrating four orthogonal subcarriers spaced at the chipping rate
  • Figure 3 is a functional block diagram of OCDMA subcarrier generation
  • Figure 4 is a graph illustrating subcarriers spaced by 3 *Rc across available spectrum
  • Figure 5 is a graph illustrating three sets of subcarriers assigned to mutually orthogonal
  • Figure 6 illustrates a typical multibeam antenna pattern with band segments assigned
  • Figure 7 is an illustrating of beam signals with spreading code P 2 applied with chipping
  • Figure 8a is a graph showing the normalized power spectrum of beam signals before
  • Figure 8b is a graph of normalized power spectrum of beam signal after spreading with
  • the invention is intended for a satellite communication system in which the satellite
  • the satellite signal may be relayed from a
  • base station or it may be generated on the satellite.
  • the FL OCDMA signal preferably incorporates the improvements of Natali U.S.
  • Each subcarrier is modulated with up to Nu orthogonal binary sequences, each carrying
  • each orthogonal function carries the data for a different user, however
  • orthogonal codes are overlaid
  • the orthogonal signals must arrive at the receiver in time synchroni sm
  • the subcarrier signal generation process is shown in block diagram form in Figure
  • the present invention is further intended for a system that incorporates the improvement
  • the subcarriers are spaced
  • N m 3.
  • N m sets of disjoint subcarrier frequencies are available in Figure 5, and can be
  • the FL signal is now modulated with a second PN sequence ? z which has chipping
  • the adjacent beam signals are isolated from the m-beam signal by virtue of the

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Relay Systems (AREA)
  • Mobile Radio Communication Systems (AREA)
PCT/US1999/010905 1998-05-19 1999-05-18 Flux density reduction in ocdma satellite communication system WO1999060806A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2000550291A JP4527879B2 (ja) 1998-05-19 1999-05-18 Ｏｃｄｍａ衛星通信システムにおける電波密度低減
DE69934883T DE69934883T2 (de) 1998-05-19 1999-05-18 Reduzierung der flussdichte in einem ocdma-satellitenkommunikationssystem
EP99933473A EP1077006B1 (de) 1998-05-19 1999-05-18 Reduzierung der flussdichte in einem ocdma-satellitenkommunikationssystem
AU49520/99A AU4952099A (en) 1998-05-19 1999-05-18 Flux density reduction in ocdma satellite communication system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/080,952 US6075781A (en) 1997-12-12 1998-05-19 Flux density reduction in OCDMA satellite communication system
US09/080,952 1998-05-19

Publications (1)

Publication Number Publication Date
WO1999060806A1 true WO1999060806A1 (en) 1999-11-25

Family

ID=22160721

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/010905 WO1999060806A1 (en) 1998-05-19 1999-05-18 Flux density reduction in ocdma satellite communication system

Country Status (7)

Country Link
US (1) US6075781A (de)
EP (1) EP1077006B1 (de)
JP (1) JP4527879B2 (de)
CN (1) CN1310893A (de)
AU (1) AU4952099A (de)
DE (1) DE69934883T2 (de)
WO (1) WO1999060806A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8185043B2 (en) 2005-02-18 2012-05-22 Panasonic Corporation Wireless communication method, relay station apparatus, and wireless transmitting apparatus

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US6711121B1 (en) * 1998-10-09 2004-03-23 At&T Corp. Orthogonal code division multiplexing for twisted pair channels
CA2276971A1 (en) * 1999-07-06 2001-01-06 Wen Tong Preamble using golay sequence for access channel in cellular communications systems
US7471735B2 (en) * 2001-04-27 2008-12-30 The Directv Group, Inc. Maximizing power and spectral efficiencies for layered and conventional modulations
US7583728B2 (en) 2002-10-25 2009-09-01 The Directv Group, Inc. Equalizers for layered modulated and other signals
US7423987B2 (en) * 2001-04-27 2008-09-09 The Directv Group, Inc. Feeder link configurations to support layered modulation for digital signals
GB0320352D0 (en) * 2003-09-01 2003-10-01 Secr Defence Digital modulation waveforms for use in ranging systems
CN101273565B (zh) 2005-09-30 2012-05-23 三菱电机株式会社 无线通信系统及无线通信方法
CN102664722B (zh) * 2005-09-30 2015-11-25 三菱电机株式会社 无线通信系统及无线通信方法
CN101485215B (zh) * 2006-07-07 2012-01-11 艾利森电话股份有限公司 使用波束成形的无线通信系统中的资源调度
CN101795493B (zh) * 2010-03-12 2012-12-26 清华大学 一种适用于geo卫星移动通信系统的星上处理交换系统
US10469217B2 (en) * 2018-04-06 2019-11-05 Qualcomm Incorporated Disentangled orthogonal frequency division multiplexing for navigation and positioning signals

Citations (6)

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US5473601A (en) * 1993-10-21 1995-12-05 Hughes Aircraft Company Frequency reuse technique for a high data rate satellite communication system
US5594941A (en) * 1994-01-11 1997-01-14 Ericsson Inc. A cellular/satellite communications system with generation of a plurality of sets of intersecting antenna beams
US5623487A (en) * 1995-05-19 1997-04-22 Stanford Telecommunications, Inc. Doubly orthogonal code and frequency division multiple access communication system
US5638361A (en) * 1995-02-08 1997-06-10 Stanford Telecommunications, Inc. Frequency hopped return link with net entry channel for a satellite personal communications system
US5687166A (en) * 1992-11-24 1997-11-11 Stanford Telecommunications, Inc. Modulation system for spread spectrum CDMA communication
US5764630A (en) * 1996-03-25 1998-06-09 Stanford Telecommunications, Inc. Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone

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JPS5856290B2 (ja) * 1979-04-04 1983-12-14 日本電信電話株式会社 移動無線通信方式
US5208829A (en) * 1991-03-26 1993-05-04 Hughes Aircraft Company Communication satellite system having an increased power output density per unit of bandwidth
US5649318A (en) * 1995-03-24 1997-07-15 Terrastar, Inc. Apparatus for converting an analog c-band broadcast receiver into a system for simultaneously receiving analog and digital c-band broadcast television signals
US5623485A (en) * 1995-02-21 1997-04-22 Lucent Technologies Inc. Dual mode code division multiple access communication system and method
US6134215A (en) * 1996-04-02 2000-10-17 Qualcomm Incorpoated Using orthogonal waveforms to enable multiple transmitters to share a single CDM channel
JP3426888B2 (ja) * 1996-12-25 2003-07-14 日本電信電話株式会社 マルチビーム通信方法およびマルチビーム通信装置

Patent Citations (7)

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Publication number Priority date Publication date Assignee Title
US5687166A (en) * 1992-11-24 1997-11-11 Stanford Telecommunications, Inc. Modulation system for spread spectrum CDMA communication
US5473601A (en) * 1993-10-21 1995-12-05 Hughes Aircraft Company Frequency reuse technique for a high data rate satellite communication system
US5594941A (en) * 1994-01-11 1997-01-14 Ericsson Inc. A cellular/satellite communications system with generation of a plurality of sets of intersecting antenna beams
US5848060A (en) * 1994-01-11 1998-12-08 Ericsson Inc. Cellular/satellite communications system with improved frequency re-use
US5638361A (en) * 1995-02-08 1997-06-10 Stanford Telecommunications, Inc. Frequency hopped return link with net entry channel for a satellite personal communications system
US5623487A (en) * 1995-05-19 1997-04-22 Stanford Telecommunications, Inc. Doubly orthogonal code and frequency division multiple access communication system
US5764630A (en) * 1996-03-25 1998-06-09 Stanford Telecommunications, Inc. Forward link carrier recovery in an OCDMA spread spectrum communication system without a pilot tone

Non-Patent Citations (1)

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Title
See also references of EP1077006A4 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8185043B2 (en) 2005-02-18 2012-05-22 Panasonic Corporation Wireless communication method, relay station apparatus, and wireless transmitting apparatus
US8422941B2 (en) 2005-02-18 2013-04-16 Panasonic Corporation Radio communication method

Also Published As

Publication number Publication date
DE69934883T2 (de) 2007-10-11
AU4952099A (en) 1999-12-06
EP1077006A4 (de) 2004-03-24
DE69934883D1 (de) 2007-03-08
US6075781A (en) 2000-06-13
EP1077006B1 (de) 2007-01-17
JP2002516548A (ja) 2002-06-04
EP1077006A1 (de) 2001-02-21
CN1310893A (zh) 2001-08-29
JP4527879B2 (ja) 2010-08-18

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